Automatic diaphragm aperture adjusting device for flash photography in camera with interchangeable lens

ABSTRACT

A diaphragm aperture adjusting device automatically detects the displacement of the inner cylinder of an interchangeable lens which is set to a distance value for focusing. The diaphragm aperture of the lens is automatically controlled to the value in accordance with the displacement of the inner lens cylinder by adjusting members for flash photography provided in the camera body. When various interchangeable lenses with different axial displacements are employed, the adjustment to compensate for the difference is made to provide proper aperture values.

' [73] Assignee:

United States Patent Fu 'ii [54] AUTOMATIC DIAPHRAGM APERTURE ADJUSTINGDEVICE FOR FLASH PHOTOGRAPHY IN CAMERA WITH INTERCHANGEABLE LENS [72]Inventor: Yoshifusa Fujii, Kaizuka, Japan Minolta Camera KabushikKaisha, Minamiku, Osaka, Japan [22] Filed: Nov. 24, 1969 [21] Appl.No.:879,014

[30] Foreign Application Priority Data Nov. 25, 1968 Japan ..43/86242[52] US. Cl. ..95/64 A, 95/10 C, 95/44 [51] Int. Cl. ..G03b 7/16, G03b9/02, G03b 17/14 [58] Field ol'Search ..95/lOC, 64 R, 64 A, 44R

[56] References Cited UNITED STATES PATENTS 3,443,496 5/1969 Sauer et al..95[ l 1 [15] 3,668,994 [4 1 June 13, 1972 3,082,672 3/ 1963 Swarofskyet al. ..95/1 0 C 3,228,314 l/l966 Koppen ...95/44 X 3,358,571 l2/l967Lange ..95/1 0 C 3,443,496 5/ l 969 Sauer et al.. 95/10 C X 3,464,3339/1969 Aoki et al... ..95/l 0 C 3,529,524 9/ l 970 Ueda ..95/ l 0 CPrimary Examiner-Joseph F. Peters, Jr. AttorneyStanley Wolder [57]ABSTRACT A diaphragm aperture adjusting device automatically detects thedisplacement of the inner cylinder of an interchangeable lens which isset to a distance value for focusing. The diaphragm aperture of the lensis automatically controlled to the value in accordance with thedisplacement of the inner lens cylinder by adjusting members for flashphotography provided in the camera body. When various interchangeablelenses with different axial displacements are employed, the adjustmentto compensate for the difference is made to provide proper aperturevalues.

5 Claim, 6 Drawing Figures PAIENTEnJun 13 m2 3.668.934

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INVENTOR l nisusn VFUJF'I BY 5% @JW ATTORNEY PATENTEDJUH 13 I9723,668,994

- 7 sum 3 or 3 INVENTOR BY .(W Mdw ATTORNEY DEVICE FOR FLASH PHOTOGRAPHYIN CAMERA ,WITI-I INTERCHANGEABLE LENS BACKGROUND OF THE INVENTION Thepresent invention relates to a device for automatically adjusting thediaphragm aperture for flash photography to be used in a camera with aninterchangeable lens and more particularly to an automatic diaphragmaperture adjusting device in a camera which is adapted for aninterchangeable lens such as a wide angle, standard or telephoto lens.In taking flash photographs, thedevice of the present invention iscapable of automatically setting an appropriate diaphragm aperture valueinterrelatedly with focusing of the lens, the device further being soadapted that when ordinary photographs are to be taken without the useof flash, the interrelating mechanism. is freed from theoperativerelation with the diaphragm operating mechanism and that diaphragmaperture setting can be inade as desired or the aperture value can beautomatically set in operative relationship with automatic exposurecontrol means, 1

With conventional cameras with an interchangeable lenses, most of thoseprovided with an automatic diaphragm aperture adjusting device for flashphotography have the adjusting device only on the lens assembly, so thatthere is a need to provide the automatic diaphragm aperture adjustingdevice for flash photography in each of the interchangeable lenses. Inaddition, in the case where the camera is provided with a diaphragmdevice for automatically setting the diaphragm aperture of the lens atthe time of taking an ordinary photograph, an interconnecting member hasto be mounted on the lens assembly to associate the diaphragm mechanismon the lens assembly with the diaphragm actuating mechanism in thecamera body; hence a drawback that the mechanism provided on the lensmount as well as the over-all camera structure becomes complex.Especially when the above-mentioned mechanism is provided in the lensmount which has only a limited space, a great deal of troubles areencountered in assembly and manufacture, while the provision of aparticular space in the lens mount makes it seriously difficult toprovide a desired'structure in designing the lens as well as variousmechanisms of the camera.

Summary of the Invention An object of the present invention' is'toeliminate the abovementioned structural drawbacks, to simplify thestructure-of an automatic diaphragm aperture adjusting device for flashphotography to be used in a camera with an interchangeable lens, toovercome various difficulties encountered in the assembly andmanufacture of the lens andvcamera body and to make the lens andmechanisms exceedingly easy to design in desired manner.

Another object of the present invention is to provide an automaticdiaphragm aperture adjusting device for flash photography which utilizespart of the automatic diaphragm operating mechanism already incorporatedin the camera body or part of the built-in automatic exposure mechanismfor automatically setting the exposure value interrelatedly with theexposure meter so that the device can be constructed with a minimumnumber of constituent elements.

Another object of the present invention is to provide a device which canbe used in a camera adapted for use with various interchangeable lensesdifferent in axial displacement such as wide angle, standard, telephotolenses and the like and yet which is capable of automatically detectingthe displacement, compensating for the difference in displacement andsetting proper diaphragm aperture values.

Still another object of the present invention is to provide very simpleswitching means by which the operation of the camera can be readilychanged over from the automatic diaphragm operating mechanism forordinary photography to automatic diaphragm adjusting device for flashphotography.

In accordance with the objects of the present invention described, thecamera body is provided in its interior with flash adjusting means whichfunctions to control .the diaphragm aperture setting operation of adiaphragm actuating member in diaphragm operating means of aninterchangeable lens while detecting the axial displacement of the innercylinder of the lens so as to make the displacement of the inner lenscylinder correspond to the diaphragm aperture value of the lens.Accordingly, there is no need to provide the lens assembly with anyautomatic diaphragm adjusting member for flash photography, but the rearend of the inner lens cylinder to be moved backward or forward bydistance control operation has only to be exposed to the interior of thecamera body for contact with the lens displacement detecting member ofthe flash adjusting means. In providing the automatic diaphragm apertureadjusting device for flash photography, such structure serves toeliminate the disadvantage to dispose a specific member in the lensmount and enhances the ease to provide the lens and The flash adjustingmeans, being composed of a very small number of levers, pins and a camformed on the lever, is simple in construction and there arise nodifficulties in making and assembling the lens and camera body.

Further in accordance with the present invention, a set lever which can.be turned from the outside of the camera body is provided, theactuating end of the set lever being disposed in engageablerelationshipwith the flash adjusting means. When the set lever is turnedin one direction, the detecting portion of the flash adjusting means isbrought into contact with the rear end of the inner lens cylinder tomake automatic diaphragm aperture adjustment for flash photography,while when the set lever is rotated in the opposite direction, the flashadjusting means is moved out of relationship with the axial movement ofthe inner lens cylinder. The set lever is turned when flash photographyis to be made and-when flash photographing operation is to be switchedto operation to take ordinary photographs. There is no trouble inperforming this procedure.

In order to insure accurate operation of the automatic diaphragmaperture adjusting device to be used in flash photography for variousinterchangeable lenses which are different in axial displacement, acompensation cam in accordance with the displacement of each lens isformed in the rear end edge of the inner lens cylinder. The compensationcam is provided by a small cutout formed in the rear end portion of theinner lens cylinder. The flash adjusting means is so constructed as tooperate through a compensation member engaged with the cutout andcompensating for the position of the detecting portion thereof. Inaccordance with the position and shape of the compensation cam, thecompensation member compensates for the position of the detectingportion of the flash adjusting means and varies the rotational ratio ofthe respective levers depending upon the kind of the interchangeablelens and its displacement. As a result, the diaphragm aperture valueautomatically set for flash photography provides proper exposure valueall the time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing of anembodiment of the p smp y;

FIG. 2 is a view of the same part shown in FIG. 1 after distance settingand shutter release;

FIG. 3 is a view of the same after automatic diaphragm aperture settingfor flash photography has been relieved and the part is set for takingordinary photographs in accordance with the indication of the exposuremeter;

FIG. 4 is a view showing another embodiment obtained by modifying partof the foregoing embodiment of the automatic diaphragm apertureadjusting device for flash photography, as shutter has. been released inthe device set for flash photography;

FIG. 5 is a view showing an embodiment for use in a camera adapted forinterchangeable lenses which are difierent in the the structure of theprincipal part present invention as it is set for flash mechanisms indesired design.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring to FIGS. 1, 2and 3, designated at 1 is part of front plate of the camera body whichis provided with a washer member 2 such as a bayonet mount for the lensmount. An

@outer lens cylinder 3 is fit in the washer member 2 at its rear end toprovide a bayonet 'mount or the like for fixing the outer lens cylinder3 in position. The contact surface 3a is in snag-fit contact with thefront face of the washer member 2. Supported on the outer lens cylinder3 in axially movable manner is an inner lens cylinder 4 whose rear endprojects into the camera body from the outer lens cylinder 3, the innerlens cylinder 4 being adapted to be moved backward or forward in theouter lens cylinder 3 when distance control, namely focusing is made. iI

Designated at 5 is an associated lever to be moved interrelatedly withshutter release. The lever 5 is mounted on a pivot 6 on the camera bodyand urged by a spring 7 in the clockwise direction as indicated by anarrow in the drawing. Indicated at 8 is a release member adapted to beactuated upon shutter release and having a bent end 8a engaged with theend 5a of the associated lever 5. Simultaneously when the shutter isreleased, the release member 8 is retracted to permit the bent end -8ato be disengaged from the end 5a of the associated lever 5, whereby theassociated lever 5 is turned in the clockwise direction about the pivot6 due to the action of the spring 7. The restoring movement of theassociated lever 5,

'namely the counterclockwise rotation of the lever to return to theposition shown in FIG. 1 after the above-mentioned pivotal movement iseffected in known manner by an unillustrated mechanism upon shuttersetting or upon completion of exposure. When the lever 5 is returned tothe original position, the bent end 8a of the release member 8 isbrought into engagement with the end 5a of the associated lever 5 toprevent its clockwise movement until subsequent shutter release is made.The associated lever 5 is further formed with a lug 5b to contact asideportion a of a control lever 10 which is urged in the counterclockwisedirection by a spring 9 so that the control lever 10 is moved, by theclockwise rotation described above, about a pivot 11 in clockwisedirection against the action of the spring 9. Further mounted on thepivot 11 is an automatic exposure cam 12 which is pushed by a pin 10b onthe control lever 10, the cam 12 thus being adapted for pivotal movementtogether with the control lever 10. The automatic exposure cam 12 isformed with a cam 12a in steplike shape disposed close to the fixedplane 13 of the camera body. Interposed between the steplike cam 12a andfixed plane 13 is a pointer 14 of the exposure meter which is adapted tobe pressed against the fixed plane 13 by the steplike cam 120 whenautomatic exposurephotographs are taken without the use of flash. Thatis to say, the position of the pointer 14 defines the clockwisedisplacement of the automatic exposure cam 12 and accordingly theposition also defines the rotational displacement of the control lever10. In this manner, the diaphragm aperture value at the time ofautomatic exposure photography is determined automatically by means of amechanism to be described later.

Designated at-15 is a diaphragm lever mounted on a pivot 16 on thecamera body and urged counterclockwise by a spring 17. An upstanding pin15a at one end of the lever 15 is engaged with the tail end 100 of thecontrol lever 10. When the control lever 10 is pivotally moved in theclockwise direction as described above,the diaphragm lever 15 followsthe tail end 10c of the control lever 10 under the action of the spring17 and turns in the counterclockwise direction to permit a diaphragm pin18 in contact with a lug 15b at the other end of the diaphragm lever 15to move in the direction indicated by an arrow in FIG. 1. Thus, thediaphragm aperture is reduced in accordance with the rotationaldisplacement of the automatic exposure cam 12. Since the amount ofrotation of the cam 12 is defined by the position to which the pointer14 is deflected, a proper diaphragm aperture value can be obtained forautomatic exposure photography and an exposure is made upon shutterrelease. When exposure is completed, the diaphragm pin 18 is returned tothe position in FIG. 1 by a known mechanism and the diaphragm isrestored to the open position.

Described above is an automatic diaphragm aperture adjusting mechanismknown in the art adapted for the camera with an interchangeable lens andemploying an automatic exposure adjusting device. Since'the presentinvention utilizes part of the automatic diaphragm aperture adjustingmechanism, the structure embodying the present invention can be madevery simplified. Further the present invention requires no special skillwhen it is incorporated in a camera as part of the known automaticdiaphragm aperture adjusting mechanism.

In applying the present invention to a camera with an automatic exposureadjusting device, the automatic exposure cam 12 must be so designed thatthe pointer 14 of the exposure meter may not be pressed against thefixed plane 13 by the cam, because flash photography does not requirethe indication of exposure amount given by the pointer 14. Anotherreason is that in the case where the pointer 14 prevents pivotalmovement of the automatic exposure cam 12, the diaphragm aperture valueis controlled by the exposure meter and it becomes no longer possible toreduce the diaphragm aperture to the desired value in flash photography.Accordingly, in such case, there is provided a change-over switch bywhich the power source circuit of the exposure meter is openedsimultaneously when the camera is set for flash photography to bring thepointer 14 to the zero position. Furthermore, at the portioncorresponding to the zero position of the pointer 14, the automaticexposurecam 12 is formed with a cutout 12b for leaving the pointerundisturbed so that the pointer 14 located at the zero position may notprevent the movement of the automatic exposure cam 12. it will. beapparent in FIG. 2 that such structure enables the cam 12 to turn freeof interference with the pointer 14,'with the result that the amount ofpivotal movement of the control lever 10 to be effected upon shutterrelease can be defined by the automatic diaphragm aperture adjustingmembers for flash photography to be described later and the diaphragmaperture setting can be obtained in accordance with the distance to thesubject.

The rotational displacement of the control lever 10 and diaphragm lever15 which are free of interference with the pointer l4'is determined bytwo levers, namely, by an automatic flash cam lever 20 mounted on apivot 19 and by a flash adjusting lever 23 mounted on a pivot 21 andurged in the counterclockwise direction by a spring 22, the diaphragmaperture thus being adapted to be set at a value in accordance with thedistance to the subject at the time of flash photography. The automaticflash cam lever 20 is provided with an automatic flash cam portion 20aand a crotch 20b to receive the pin 15a on the diaphragm lever 15, thearrangement being such that the diaphragm lever 15 and the cam lever 20may be moved pivotally in the same direction in interrelated manner.-

As illustrated in the drawing, the shape of the cam portion 20a isprovided by a nonlinear concave edge the curve of which is appropriatelydetermined by the displacement of the inner lens cylinder 4 to beeffected in distance control and the amount of diaphragm aperturereduction by the diaphragm blades. On the other hand, the flashadjusting lever 23 mounted on the pivot 21 on the camera body has afollower pin 23a at one end which is urged into contact with the rearend face 4a of the inner lens cylinder 4 by the action of a spring 22.In response to the forward or backward movement, namely axialdisplacement, of the inner lens cylinder 4, the flash adjusting lever 23is therefore turned about the pivot 21.

The tail end of the flash adjusting lever 23 is provided with a controlpin 23b which, while the follower pin 23a is kept in contact with therear end face 4a of the inner lens cylinder 4, is in contact with thecam portion 20a of the automatic flash cam lever 20 so as to limit theamount of the counterclockwise movement of the cam lever 20 and thediaphragm lever operatively associated therewith in accordance with thedisplacement of the inner lens cylinder 4.

In the state in F IG. 1 set for flash photography the inner lenscylinder 4 is moved forward as indicated by the arrow when focusing ismade. Accordingly, the flash adjusting lever 23 whose follower pin 23ais in contact with the rear end face 4a of the lens cylinder 4 ispivotally moved in the counterclockwisedirection about the pivot 21under the action of the spring 22 and stopped at the positioncorresponding to the dis placement of the inner lens cylinder 4 upon thecompletion of focusing. If the shutter is released in this position, thediaphragm lever 15 is moved in the counterclockwise direction about thepivot 16 as already described. However, since the automatic flash camlever is also moved counterclockwise about the pivot 19 together withthe diaphragm lever 15, the'cam portion 20a of the automatic flash camlever 20 strikes the control pin 23a at the tail end of the flashadjusting lever 23, with the result that the pivotal movement of the camlever is prevented and that of the diaphragm lever 15 is also stopped tobring about the state shown in FIG. 2. That is to say, the diaphragm pin18 reduces the diaphragm aperture in accordance with the pivotaldisplacement of the diaphragm lever 15, so that the aperture value atthis time corresponds to the axial displacement of the inner lenscylinder 4, namely, to thedistance to the subject. The diaphragmaperture value in flash photography is determined by the guide number ofthe flash bulb and distance. Where the guide number is constant, theaperture value is a function of the distance.

In order to switch the operation from flash photography to automaticexposure photography or ordinary photographing operation without use offlash, or vice versa, a set lever is fixedly'mounted, as shown in FIGS.1 and 3, on a pivot 24 which is rotated by an unillustrated operatingmember exposed outwardly from the camera body. The end of the set lever25 is adapted to move into engagement with a bent portion 23c of theflash adjusting lever 23. It is convenient to provide the set lever 25or part of the pivot 24 with a changeover switch for changing over thecircuit from the power source circuit of the exposure meter to the powersource circuit for flash photography every time the operation isswitched from automatic exposure photography to flash photography. 7Referring to the state shown in FIG. 1, when the pivot 24 is turned inthe counterclockwise direction by the external operating member, the end25a of the set lever 25 contacts the bent portion 230 of the flashadjusting lever 23 and turns the lever 23 in the clockwise directionagainst the action of the spring 22. The follower pin 23a isconsequently moved out of contact with the rear end face 4a of the innerlens cylinder 4 and the control pin 23b at the tail end of the flashadjusting lever 23 gets retracted from the front side of the cam portion20a of the automatic flash cam lever 20 as shown in FIG. 3, the camlever 20 thus being made free to turn independently of the flashadjusting lever source circuit of the exposure meter is closed and thepointer 4 deflects rightward in the drawing in accordance with theamount of light received by the exposure. Since the cam lever 20 is nolonger under the control of the flash adjusting lever 23, the diaphragmlever 15 is now controlled by the automatic exposure cam 12 in itspivotal movement. When the shutter is released in the state shown inFIG. 3, therefore, an automatic exposure photograph which is controlledby the deflection of the pointer 14 is taken. FIG. 3 shows the parts asthey are set for automatic exposure photography.

To switch the camera from the position set for automatic exposurephotography to flash photography operation, the pivot 24 is turnedclockwise from the state in FIG. 3 to that shown in FIG. 1. With thismovement, the set lever 25 is 6 23. On the other hand, the powerpivotally moved clockwise together with the pivot 24 to free the end 25afrom pressing engagement with the flash adjusting lever 23, which isaccordingly rotated counterclockwise about the pivot 21 under the actionof the spring 22 to engage the follower pin 23a with the rear end face40 of the inner lens cylinder 4 and to bring the control pin 2312 intocontact with the cam portion 20a of the automatic flash cam lever 20 asshown in FIG. 1.

In case of a camera with mechanism of common type which has no automaticexposure system (i.e. a mechanism in which the diaphragm aperture isleft open except when it is reduced to a specified value only during theperiod between shutter release and completion of exposure), theautomatic exposure cam 12 is omitted and the diaphragm aperture controlis made manually in taking ordinary photographs. In this case, theautomatic flash cam lever 20 is operatively associated with thediaphragm lever 15.

In the foregoing embodiment, the automatic flash cam lever 20 anddiaphragm lever 15 are pivotally moved in the same directionsimultaneously when the shutter is released as well as when shuttersetting is made. For this reason, it is possible to provide these twomembers as a single member. FIG. 4 shows an embodiment in which theautomatic flash adjusting lever 20 in the foregoing embodiment isomitted, the diaphragm lever serving as a diaphragm lever and auto maticflash adjusting lever. The members similar to those in the embodiment inFIGS. 1 to 3 are indicated by similar reference numerals.

Referring to FIG. 4, a flash adjusting lever 123 is pivotally mounted inthe camera body on the pivot 21 at its one end and urged clockwise bythe spring 22, a follower'pin 123a on the lever 123 being in engagementwith the rear end face 4a of the inner lens cylinder 4 so that the flashadjusting lever 123 may be moved about the pivot 21 in accordance withthe displacement of the inner lens cylinder 4. It will be seen in thedrawing that the other end of the flash adjusting'lever 123 is bent in ahooklike shape with a cam portion 123b formed along its end, a recess123f being formed in the bent portion. On the other hand, thediaphragmlever 115 is provided with a bent end 1l5c to be brought intocontact with the cam portion 123b of the flash adjusting lever 123, inaddition to a pin 11511 to follow the control lever 10 and a lug 1 15bto move the diaphragm pin 18 in the diaphragm aperture reducingdirection. When the axial movement (i.e. distance control) of the innerlens cylinder 4 is made, the turning of the flash adjusting lever 123thereby eflected shifts the relationship in position between the camportion 123b and the bent'end 1150 of the diaphragm lever 115 inaccordance with the displacement of the inner lens cylinder 4. Uponshutter release being made after the distance control, the diaphragmlever 115 is turned about the pivot 16 in the counterclockwise directionto cause the lug 1 at its end to strike the cam portion 123b of thelever 123, whereupon the diaphragm lever 115 is stopped. The diaphragmpin 18, following the movement of the lug 115b of the diaphragm lever115, moves the diaphragm blades to reduce the aperture. The aperturesize thus provided corresponds to the axial displacement of the innerlens cylinder 4. Although FIG. 4 shows the state after the shutterrelease has been made and the position of the parts as the shutter is incocked position is not shown, the diaphragm lever 115, while the shutteris cocked, is located in the position corresponding to that of thediaphragm lever 15 in FIG. 1 with the bent end 115c spaced apart fromthe cam portion 12311 of the flash adjusting lever 123.

Referring to FIG. 4, the set lever 25 is turned counterclockwise by anactuating member provided externally of the camera body when flashphotographs are not taken. This movement causes the end 25a of the setlever 25 to push the bent portion 123cof the flash adjusting lever 123to such a position that the bent end 1150 of the diaphragm lever 115 canbe urged into the recess 123f of the flash adjusting lever 123. When theshutter release is made in this state, the diaphragm lever 115 will bemoved counterclockwise, but the an automatic diaphragm bent end 1150does not strike the flash adjusting lever 123 but moves into therecess123f, the diaphragm lever 115 thus being left independent of the'fiashadjusting lever 123.

, It will be understood from the description above that in flashphotograph taking operationthe present device automatically adjusts thediaphragm aperture to the proper value which isappropriate to flashphotography upon detecting the axial displacement'of the inner lenscylinder, namely upon detecting focusing of the lens. However, withinterchangeable lenses with different photographing distances andvarying displacements, there is a need to provide each of the lenseswith means for compensating for the difference in displacement if thepresent device is to be employed as it is, whereas it is quitedisadvantageous to mount the'compensation means in each of the lensmounts since the space is limited and great difficulties are thereforeencountered in design, assembly and manufacture. FIGS. and 6 illustratean embodiment of a device which is most useful in such application. v

' Referring to FIGS.v 5 and 6 in which the parts similar to those inFlGS. l to 4 are indicated by similar reference numerals, a follower pin226a to be kept in contact with the rear end face 204a of the-inner lenscylinder 204, instead of being fixed to a flash adjusting lever 223, isprovided on a compensation plate 226 which is formedwith a slot 226b. Apivot 22] supporting the flash adjusting lever 223 extends through theslot 226b in the compensation plate 226 to allow the plate 226 to movefreely along the slot 226b. By means of a tension spring 227, thecompensation plate 226 is urged upward as seen in the drawings. Thecompensation plate 226 is further provided, at its tail end, with acompensation pin 226c which is urged by the tension spring 227 intosliding contact with a compensation cam 204b provided by a cut-outportion in the rear end of the inner lens cylinder 204. The flashadjusting lever 223 has an arm 223d pressed against the follower pin 226under the action of the spring 22 which biases the flash adjusting lever223 in the counterclockwise direction. The follower pin 226 2 istherefore pressed on the rear end 2040 of the inner lens cylinder 204.

in the structure described, when the pin 2260 is brought into engagementwith the-cam 204b the distance A' between the pivot 221 and thefollowerpin 226a. is determined, while the distance B between thepivot'22landthe control pin 2231; is always constant (see HQ. 5). Byproviding the compensation cam 204b whose position and shape are sodefined as to effect compensation depending uponthe displacementpeculiar to the lens for which the compensation cam 204k is provided,the ratio of the distance B between-the pivot 221 and control pin 223 tothe distance A between the follower pin 226a and pivot 22], namely B/A,can be determined at an appropriate value for each lens. That is to say,it is so designed that B/A is great fora lens of small displacementwhile B/A is small for a lens of great displacement. In this case, theshape of the curve for each lens represented by the distance anddisplacement may be slightly difierent from one another depending uponthe type of the lens, but in practical application as the automaticflash device, the difference is so small'that it is negligible.

' When the inner lens cylinder 204 is moved forward or backward byfocusing, the compensation plate 226 moves vertically along the cam 204band compensates for the distance A, the flash adjusting lever 223pressing the arm 223d against the follower pin 226a thereby beingpivotally moved by a rotational angle in accordance with thecompensation value. Consequently, the position of the control pin 2231:which controls the amount of rotation of the automatic flash cam leverin contact with the cam portion 20a thereof is compensated, whereby therotational displacement of the cam lever 20 and of diaphragm lever 15,and therefore the amount of diaphragm aperture reduction are properlyadjusted. In the case where various interchangeable lenses are usedwhich are different in photographing distance and in the axialdisplacement, the compensation cam 20411 formed in the inner lenscylinder 204 at'the proper position and provided with an appropriateshape serves to automatically provide a properly adjusted diaphragmaperture value for flash photography.

When photographs are taken in ordinary manner without using flash, theset lever 25 is operated to move the flash adjusting lever 223 clockwiseas in the foregoing embodiments. The compensation lever 226, thoughincluded in the device, causes no trouble during'this procedure. Theswitching operation of the set lever is carried out in the'same manneras in the foregoing embodiments. i

I claim: v

1. An automatic diaphragm aperture adjusting device for flashphotography in a camerawith an interchangeable lens comprising flashadjusting means disposed in the camera body for detecting thedisplacement of the inner cylinder of said interchangeable lens andadapted to control the diaphragm aperture reducing operation of adiaphragm actuating member in a diaphragm operating mechanism of saidlens in accordance with the displacement of the inner lens cylinder soas to make a diaphragm aperture value correspond to the displacement .ofsaid inner lens cylinder, saidv flash adjusting means including a memberfor detecting the displacement of the inner cylinder of saidinterchangeable lens, an operating member for reducing the diaphragmaperture of the lens in accordance 'with the displacement detected bysaid detecting member and a set lever for moving said detecting memberinto or out of engagement with said operating member, said set leverbeing adapted to be operated by an actuating portion provided externallyof the camera body, a compensation cam provided in a portion of theinner cylinder of each of various interchangeable lenses which aredifierent-in displacement, said cam being formed in accordance with thedisplacement of each lens, and a compensation member provided with afollower pin whose position is determined by said compensation cam, saidflash adjusting means beingadapted to detect the displacement of theinner lens cylinder through the follower pin of said compensationmember. T v i I 2. The device as claimed in claim 1 wherein thediaphragm actuating member in said diaphragm operating mechanism of thelens comprises a diaphragm lever in an automatic diaphragm operatingmechanism of the camera.

3. An automatic diaphragm aperture adjusting device for flashphotography in a camera provided with an interchangeable objective lensincluding an axially adjustable focussing lens barrel, a variableaperture diaphragm and a diaphragm aperture varying member whichadjustszsaid variable aperture diaphragm, a sensing element mounted tothe body of said camera and releaseablyengaging and following saidbarrel and equally axially movable therewith, and means responsive tosaid sensing member for adjusting said diaphragm varying member inaccordance with the axial adjustment of said barrel.

4. The device of claim 3 wherein said diaphragm adjusting meanscomprises a swingable first lever including a follower and carrying saidsensing element and movable therewith, a swingable second lever having acam engaging said follower and being responsive to the movement of saidfirst lever, and coupled to said diaphragm to adjust said diaphragmaperture with said barrel axial movement.

5. An automatic diaphragm aperture adjusting device ina camera withexchangeable objectives comprising an exchangeable objective including;an axially movable lens cylinder; an adjustable aperture diaphragm; adiaphragm setting member for adjusting said diaphragm; connecting meansprovided at the rear end of said lens cylinder to adjust a diaphragm toa distance at the time of flash photography with said exchangeableobjectives; and a camera body to be equipped with said exchangeableobjectives including! a diaphragm actuating means to actuate saiddiaphragm setting member relative to shutter release means; a flashadjusting member releaseably engaging said connecting means; controlmeans to control said diaphragm actuatingmeans relative 'to saidadjusting member; an ordinary photography setting means to disengagesaid connecting means of said exchangeable objectives from said controlmeans relative to said flash adjusting member at the time of ordinaryphotography.

1. An automatic diaphragm aperture adjusting device for flashphotography in a camera with an interchangeable lens comprising flashadjusting means disposed in the camera body for detecting thedisplacement of the inner cylinder of said interchangeable lens andadapted to control the diaphragm aperture reducing operation of adiaphragm actuating member in a diaphragm operating mechanism of sAidlens in accordance with the displacement of the inner lens cylinder soas to make a diaphragm aperture value correspond to the displacement ofsaid inner lens cylinder, said flash adjusting means including a memberfor detecting the displacement of the inner cylinder of saidinterchangeable lens, an operating member for reducing the diaphragmaperture of the lens in accordance with the displacement detected bysaid detecting member and a set lever for moving said detecting memberinto or out of engagement with said operating member, said set leverbeing adapted to be operated by an actuating portion provided externallyof the camera body, a compensation cam provided in a portion of theinner cylinder of each of various interchangeable lenses which aredifferent in displacement, said cam being formed in accordance with thedisplacement of each lens, and a compensation member provided with afollower pin whose position is determined by said compensation cam, saidflash adjusting means being adapted to detect the displacement of theinner lens cylinder through the follower pin of said compensationmember.
 2. The device as claimed in claim 1 wherein the diaphragmactuating member in said diaphragm operating mechanism of the lenscomprises a diaphragm lever in an automatic diaphragm operatingmechanism of the camera.
 3. An automatic diaphragm aperture adjustingdevice for flash photography in a camera provided with aninterchangeable objective lens including an axially adjustable focussinglens barrel, a variable aperture diaphragm and a diaphragm aperturevarying member which adjusts said variable aperture diaphragm, a sensingelement mounted to the body of said camera and releaseably engaging andfollowing said barrel and equally axially movable therewith, and meansresponsive to said sensing member for adjusting said diaphragm varyingmember in accordance with the axial adjustment of said barrel.
 4. Thedevice of claim 3 wherein said diaphragm adjusting means comprises aswingable first lever including a follower and carrying said sensingelement and movable therewith, a swingable second lever having a camengaging said follower and being responsive to the movement of saidfirst lever, and coupled to said diaphragm to adjust said diaphragmaperture with said barrel axial movement.
 5. An automatic diaphragmaperture adjusting device in a camera with exchangeable objectivescomprising an exchangeable objective including; an axially movable lenscylinder; an adjustable aperture diaphragm; a diaphragm setting memberfor adjusting said diaphragm; connecting means provided at the rear endof said lens cylinder to adjust a diaphragm to a distance at the time offlash photography with said exchangeable objectives; and a camera bodyto be equipped with said exchangeable objectives including: a diaphragmactuating means to actuate said diaphragm setting member relative toshutter release means; a flash adjusting member releaseably engagingsaid connecting means; control means to control said diaphragm actuatingmeans relative to said adjusting member; an ordinary photography settingmeans to disengage said connecting means of said exchangeable objectivesfrom said control means relative to said flash adjusting member at thetime of ordinary photography.